package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl  implements DishService {


    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */

    @Transactional
    public void saveWithFlavor(DishDTO dishDTO){

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取生成主键值
        Long dishId = dish.getId();


        //向口味表插入n条数据

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }


    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
   public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO){
       PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
       Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

       return new PageResult(page.getTotal(),page.getResult());
   }


    /**
     * 菜品批量删除
     * @param ids
     * @return
     */


    @Transactional
     public void deleteBatch(List<Long> ids){
         //是否在售？
         for(Long id : ids){
             Dish dish = dishMapper.getById(id);
             if(dish.getStatus() == StatusConstant.ENABLE){
                 //处于起售中，不能删除
                 throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
             }
         }

         //是否套餐关联？
         List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
         if(setmealIds != null && setmealIds.size() > 0){
             throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);

         }
//         删除菜品表中的菜品数据
//         for(Long id : ids){
//             dishMapper.deleteById(id);
//             //删除菜品表关联的口味数据
//             dishFlavorMapper.deleteByDishId(id);
//         }


        //根据菜品Id集合批量删除菜品数据和口味数据
        //sql delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);
         dishFlavorMapper.deleteByDishIds(ids);

     }




    /**
     * 根据id查询菜品和口味数据
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavour(Long id){

        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据id查询口味数据
        List<DishFlavor> disFlavors= dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(disFlavors);
        return dishVO;
    }

    /**
     * 根据Id修改菜品信息和口味信息
     * @param dishDTO
     */

    @Transactional
    public void updateWithFlavor(DishDTO dishDTO){

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }
    }


    /**
     * 根据分类Id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId){
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);

    }


    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id){
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if(status == StatusConstant.DISABLE){
            //如果是停售，将包含该菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIds != null && setmealIds.size() > 0){
                for(Long setmealId : setmealIds){
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
